Finding the Fourth Proportional to 1,366.87, 1,887.15 and 947.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,366.87 : 1,887.15 = 947.07 : x
2. Step 2: Convert to fraction form
   1,366.87/1,887.15 = 947.07/x
3. Step 3: Cross multiply
   1,366.87x = 1,887.15 × 947.07
4. Step 4: Simplify right side
   1,366.87x = 1,787,263.15
5. Step 5: Solve for x
   x = 1,787,263.15/1,366.87
6. Step 6: Final answer
   x = 1,307.56